Question about 1983 Chevrolet C2500

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1978 chevy k20 4x4 truck

Lately, my transmission stop shifting into third gear, and if does, it would shift back down to second gear.

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  • 10 more comments 
  • Anonymous Dec 04, 2008

    I had a whole in my vacuum line. I change that and the valve, I still have the same problem

  • Anonymous Dec 05, 2008

    I had a whole in the vacuum line, and I changed that and the valve. My tranny still doesn't change into third gear. Please help

  • Anonymous Mar 14, 2014

    my 1994 q 45 infinity transmission doesn't shift from second to third

  • Anonymous Mar 19, 2014

    stays in third gear at stop light

  • Anonymous Mar 19, 2014

    the problem i have is i have a 88 chevy 4wd 700r4 and it wont shift into second gear

  • Anonymous Mar 23, 2014

    wont go into third gear

  • Anonymous Mar 25, 2014

    My 4l60e shift out of first fine and second fine but when it goes to third its like it down shifted back to first

  • Anonymous Mar 27, 2014

    transmission stuck in second gear

  • Anonymous Mar 28, 2014

    Just replaced the 4l60e and seems to run good the only thing is that the passing ge

    ar doesn't kick down like it should how do I ajust
    Just had my transmission replaced and was wondering how to ajust my passing gear on my 93chevy1500 pickup do you have any idea how to slove this problem

    to work properly do you have any idea how to

  • Anonymous Mar 30, 2014

    ges
    oes into gear but will not go through shift stag

  • Anonymous Mar 30, 2014

    goes into gear but will not go through shift stages on acceleration

  • Anonymous Apr 01, 2014

    4t65e transmission

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  • 109 Answers

Try checking your vacume lines..

Posted on Dec 02, 2008

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  • 314 Answers

SOURCE: I have a 1978 chevy

On the back right side of the tranny you will find the modulator valve with a vaccum line. First check the the line is ok, if so, replace the valve. Note; there is an adjusting screw inside the vaccum hose fitting to change the shift modes. Don't mess with it unless necessary! Frankster016

Posted on Dec 02, 2008

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I have a 1978 chevy k20 4x4 truck. Lately my transmission will not shift to third gear, and if it does, it shift back down to second gear.


On the back right side of the tranny you will find the modulator valve with a vaccum line. First check the the line is ok, if so, replace the valve. Note; there is an adjusting screw inside the vaccum hose fitting to change the shift modes. Don't mess with it unless necessary! Frankster016

Dec 02, 2008 | Chevrolet C2500 Cars & Trucks

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